True Gapless binder allows pages to turn smoothly without falling out and features a clear overlay for customizing the exterior. Pages flow smoothly because patent-pending, one-piece rings have no gaps. Individual steel rings snap securely into their base and will not open when the binder is dropped. Back-mounted, locking rings can lie flat when not in use, which maximizes storage space and makes the empty binder easier to transport. 3 ring capacity holds up to 670 sheets. View binder offers view covers and spine, exposed rivets and white interior pockets that hold up to 50 sheets. Heavy-duty cover is made of sturdy, 32mm, chipboard board over polypropylene.